All,

We are having engineered BR111 Amendoim glue down installation over concrete slab. According to the manufacturers spec the concrete slab needs to be flat to within 3/16 of an inch over 10 feet.

The installer claims this spec applies only "in the direction parallel to the wood installation". The issue I have is in the direction perpendicular to the wood installation the concrete slab has a valley of 1/2 of an inch over 6 feet. I want that valley flattened out to within 3/16th of an inch both parallel and perpendicular to the wood install. The installer thinks I am being perfectionist. I think I am being prudent to get the floor installed right. The installer insists on an extra 1000 dollars since my request is above and beyond a normal installation. I think it is time to find a new installer. What do you all think, am I being overly perfectionist?

Thanks

Your correct, it goes both ways.

However the cost is definetly higher as far as I am concerned. Would you expect someone to do twice the amount of work for the same price? Of course that would depend on the way he presented the quote I guess.

If he was going to do it one direction and disregard the other then I might change installers.

I try and get it both ways without any significant extra costs to the enduser. Grinding the slab helps immensely verses floating. But then you should also realize there is a difference between flat and level.

Thanks Steve,

I do realize the difference between flat and level (which is why I specifically use the term flat in my original post). We had agreed on getting the floor flat to within manufacturer specs in the contract. It never crossed my mind the installer would come up with such an argument that the spec only applies in one direction. The installer insists the valley of 1/2 inch perpendicular to the wood direction is OK. From past experience with hardwood installs I know it is not.

Thanks again for your confirmation

I have never heard of a manufacturers flatness spec vary , on the same installation, of a particular product. Not to mention... according to which direction the product is installed. If they state 3/16" in 10'.....that's defined as all directions of the substrate.

Agreed..its a 10 ft radius...and industry would allow for 1/4...

he will have a nice time either way getting that floor to sit without a ton of weight in that area.